godot-plateformer/addons/reedscene/prop/PropState.gd

@tool
@icon("res://addons/reedscene/prop/icon/prop_state_icon.svg")
class_name ReedPropState extends Node

##状态编号，默认为-1，-1是不可用编号，状态编号由StateManager发布，不可以自己修改。
@export_custom(PROPERTY_HINT_NONE, "", PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_READ_ONLY) var state_id: int  = -1
##该State的信息是否需要被存入Save中
@export var save_game: bool = false

##预装的一些Effect，可以用来对State进行一些初始化
@export var effects: Array[ReedPropEffect] = []

##State的拥有者
var _owner
##State的prop comp
var _owner_prop_comp

## 是否已经初始化
var _inited: bool = false

##初始化State
func init(owner: Node, prop_comp: Node) -> bool:
	# 防止重复初始化
	if _inited:
		push_warning("ReedPropState [%s] already initialized." % name)
		return false

	if owner == null:
		push_error("ReedPropState [%s] init failed: owner is null." % name)
		return false

	if prop_comp == null:
		push_error("ReedPropState [%s] init failed: prop_comp is null." % name)
		return false

	_owner = owner
	_owner_prop_comp = prop_comp
	_inited = true
	return true

##是否可以进入此状态，默认为真
func can_enter(_current: ReedPropState, _ctx: Dictionary) -> bool:
	return true

##State进入
func on_enter(_from: ReedPropState, _ctx: Dictionary) -> void:
	if not _inited:
		push_error("ReedPropState [%s] entered before init!" % name)
		return
	
	for e in effects:
		e.apply(_owner, _owner_prop_comp, _ctx)

##State退出
func on_exit(_to: ReedPropState, _ctx: Dictionary) -> void:
	pass